On the Scottish archipelago of St. Kilda, the Soay sheep may not have any natural predators, but they do have the elements to contend with: a lack of food, brutal weather that can kill off half the ...

In Australia only 5 per cent of sheep are bred using artificial insemination New research hopes to increase the conception rates in ewes from frozen sperm The anatomy of the sheep's reproductive ...

1. Fitness costs of reproduction are expected when resources are limited. Costs drive the evolution of life-history strategies and can affect population dynamics if females change their allocation of ...

This is a preview. Log in through your library . Abstract A central theme in life history theory is to determine how reproduction varies with age in iteroparous organisms. Evidence of ageing and ...

Scientists report that results from studies of adolescent female sheep suggest that teenaged girls who become pregnant before reaching full growth may not be able to supply their fetuses with adequate ...

A viral gene embedded in the sheep genome plays an essential role in the growth of the animal's placenta, according to a study of impregnated sheep. The result strengthens the case that similar viral ...